This is the only gem-set Royal Oak in the anniversary programme that keeps both the date and applied hour-markers, and the reason is the cut. The fully set references use baguettes, which sit in channels cut into the dial and have to run unbroken to look right, so those watches drop the date rather than put a window through a continuous stone surface, and they drop the markers because the stones are the dial. Here the stones are brilliant-cut and set into the dial rather than laid across it as a paved run, which leaves room for both. The consequence shows in the height as well. This reference measures 10.5 mm, exactly the same as the unset 41 mm Royal Oak of the same generation, where the baguette-set version of the same case reaches 11.6 mm. Setting a dial in brilliants costs nothing in thickness. Setting it in baguettes costs more than a millimetre.
The case is 41 mm across and 10.5 mm thick in white gold, with the octagonal bezel set with diamonds. The eight hexagonal screw positions survive the setting and remain the fixed points the run of stones is arranged around. The dial is set with brilliant-cut blue sapphires graded across its surface, running darker at the outside and lightening toward the centre, which is an approach no other reference in the programme uses. Every fully set reference carries one stone at one saturation; this one uses a single species sorted by depth of colour and arranged so that the dial appears lit from within. Achieving that requires the stones to be selected and placed by tone rather than simply matched, which is a different sorting problem from the one the baguette references solve. White gold applied hour-markers and Royal Oak hands sit above the setting. The bracelet is integrated white gold set with brilliant-cut diamonds, tapering from the case and closing on an AP folding clasp, so the watch carries sapphires on the dial and diamonds on the bezel and bracelet rather than repeating one stone throughout. That division is the opposite of how the baguette references are built, where a single species runs from the dial to the clasp without interruption, and it gives this reference a hierarchy the others deliberately refuse: colour at the centre, brilliance at the edges.
The function set is hours, minutes, centre seconds and a date. Retaining the date on a gem-set dial is the distinguishing practical feature of this reference within the anniversary programme, and the applied markers matter as much, because they give the eye fixed points against a surface that is otherwise in constant motion. A graded dial reflects unevenly by design, and without markers the hands would have to be located against a field that changes brightness across its own radius. Centre seconds keeps all three hands on a single axis. The result is a watch that is fully set and still reads at a glance, which is not true of the baguette references at either size.
The Royal Oak is the collection Audemars Piguet is built on, and the anniversary programme approached gem-setting three separate ways. The baguette references set dial, bezel and bracelet in one coloured stone across ten stones and two case sizes, at 41 mm and at 37 mm, giving twenty references that all omit the date. Two further 41 mm references drop the single-stone rule for graded mixtures, one combining black sapphires with tsavorites and smoky quartz, the other pairing graded blue sapphires with Swiss blue topaz. This reference takes the third route, using one species graded by tone with diamonds on the bezel and bracelet and keeping the full function set. Blue is the colour the programme returned to most often, appearing as sapphire, tanzanite and blue topaz among the baguette references and again in both graded dials.
This reference suits a collector who wants a fully set Royal Oak that still works as a watch. The trade the baguette references ask for is real: no date, no markers, and a dial that has to be read by hand position alone. This one asks for none of it while remaining set on the dial, the bezel and the bracelet, and it does so without the thickness penalty the baguette construction carries. The graded sapphire dial is also the most technically interesting surface in the programme, since sorting stones by tone and placing them to produce a gradient is a harder brief than matching a run to a single colour. It appeals to someone who has looked at the single-stone references and found them uncompromising in a way that limits when the watch can be worn, and to someone who wants blue in its most worked form rather than its most saturated. The anniversary designation ties production to the occasion rather than to an open catalogue run.
